In the earliest days of the game, Trainer cards had no restrictions on their use, so with the maximum 4 copies allowed in the deck, a player could draw 8 extra cards in one turn if they were all in the hand during the same turn
Outside of the mill strategy, Mudora the Cestus Oracle and Keldo the Possessed Statue can summon themselves easily, so you can rely on strong extra deck monsters like Bagooska and even Baronne to push for game
(Any other effects of attacks still happen.) CC - Quick Attack (10+) Effect: Flip a coin
Any other non-Human creatures that enter the battlefield at the same time as Grumgully won't get a +1/+1 counter
For example, Pokmon TCG Pocket s battle matching is unbalanced, with high-power decks becoming ubiquitous with no way for people to avoid playing against them
SR Super Rare Crystal Beast Rainbow Dragon X LIGHT Level 8 [ DragonEffect ] ATK 3000 DEF 0 If this face-up card is destroyed in a Monster Zone, you can place it face-up in your Spell & Trap Zone as a Continuous Spell, instead of sending it to the GY